make argument of cmakedefine be consistent with variable in CMakeList

CMakeLists.txt

@@ -15,13 +15,13 @@ else()
     message(WARNING "You are using an unsupported compiler! Compilation has only been tested with Clang and GCC.")
 endif()
 
-option(WITH_GLOG "With glog" OFF)
+option(BRPC_WITH_GLOG "With glog" OFF)
 option(DEBUG "Print debug logs" OFF)
 option(WITH_DEBUG_SYMBOLS "With debug symbols" OFF)
 option(BUILD_UNIT_TESTS "Whether to build unit tests" OFF)
 
 set(WITH_GLOG_VAL "0")
-if(WITH_GLOG)
+if(BRPC_WITH_GLOG)
     set(WITH_GLOG_VAL "1")
 endif()
 
@@ -97,7 +97,7 @@ if ((NOT LEVELDB_INCLUDE_PATH) OR (NOT LEVELDB_LIB))
     message(FATAL_ERROR "Fail to find leveldb")
 endif()
 
-if(WITH_GLOG)
+if(BRPC_WITH_GLOG)
     find_path(GLOG_INCLUDE_PATH NAMES glog/logging.h)
     find_library(GLOG_LIB NAMES glog)
     if((NOT GLOG_INCLUDE_PATH) OR (NOT GLOG_LIB))

docs/cn/getting_started.md

@@ -262,7 +262,7 @@ When you remove tcmalloc, not only remove the linkage with tcmalloc but also the
 
 ## glog: 3.3+
 
-brpc implements a default [logging utility](../../src/butil/logging.h) which conflicts with glog. To replace this with glog, add *--with-glog* to config_brpc.sh or add `-DWITH_GLOG=ON` to cmake.
+brpc implements a default [logging utility](../../src/butil/logging.h) which conflicts with glog. To replace this with glog, add *--with-glog* to config_brpc.sh or add `-DBRPC_WITH_GLOG=ON` to cmake.
 
 ## valgrind: 3.8+